Container forming machine



Nov. 14, 1950 s. R. HOWARD CONTAINER FORMING MACHINE 3 Sheets-Sheet 1Filed April 15. 1947 m a .wNN

' INVENTOR- 74/7/5 Q umcull A TTOR NE V Nov. 14, 1950 s, R, HOWARD2,529,732

CONTAINER FORMING MACHINE FiI ed April 15. 1947 :5 Sheets-Sheet 5 IN VEN TOR.

S ok/e E bwara BY IM QLMQLL L ATTORNEY imvirrg novel reciprqc atp I'ratus imwhifipr vision s made fur "mounting Y fthe cboperating ea n-g"ifienibrs in avmanne i 1y Stguiley m i'mwara; 1 Miam Ma g as'sighiaiitbi Pheumatib sal Corporation; LimitedpQuincy, *Masgmconporflioh ofMassachusetts hdisimnar Bags;

' "Wim"this' genrai-b ect*imview mdmh.

Ethfs "as may"hermgfteriappeazr the inveritibh consists in the"cofitain'ei forming machihe and in thevarivusstructurs, arrangementaridgourbifiations of parts herina'fter described and pa'r- :vijew'diagrammati caiiyiilustr ting'a uplex type machine fofforming,'filiingflmi sealing tea bags general, the resefivinventibn'conterhp l fies a container sealing machine providedWithribVl {n atsealing apparatu ,e'inbo'dying cdoprafiilqg heat sealing offpre'ssure"'applying eleixintspgr} "ticlilarly "ada ted forsealingiogther contacting "b'le alignthgjsaiin' 'membrtjn Tg isteredrelation q'wiplh its 't'ippoSEd ailing mem grm a convenirit {It};e'fficightf' manuer as will b" hereinafter inbre mny-iiescribea Rfrrm'mswv u triex-aiawingsy'the' illustrated "galiiifg papef'teaba'g's,'suchasjthe machine ji1jmstrafqed ana describea iii-the tinited StatesPate t' g5 2335229 isQtijdfo'Q' Patterson, September '1 andasher'iwsmwn, see Fig. *8, sub-h M ay arranged in. duplex form fcir's'imuitanous li 1* uci'ng two-strips or connectelu of 553"f6ifi1i11gmaterial l'ozis supply r611 thereof b'yfwithdrawinghamsmintimated-generally at 112 and advanced ove'rfiiig formingmechanism 14 which operates? ld me w'eb ltm'gitudina'uy along 'a theoperation of the strip advancing and heat sealing mechanisms I8, 20respectively, and, in

filled and sealed bags. t

7 Referring now to Fig. l, the present ,heat seal- 7 ing apparatusincludes duplex units 20 arranged portions 12 of the registering pins bya substantially centrally disposed spring pressed pin 14 extending fromthe supporting member and engageable with the rear face of the plate 66.As illustrated in Fig. l, the registration pins 68, 69 are tapered attheir forward ends and extend into suitable openings formed in theopposed plate 44 so "that operation when opposed sealing 'members aremoved towardieach .other during the sealing operation, the plate 44 iscaused to move in any direction in a vertical plane relative to the forsimultaneous operationupon two strips of bag forming material, and, asherein'shown,v eachunit includes a pair of cooperating L-shaped sealingmembers 30, 32 mounted for horizontal recipro-v cation into and fromengagement with the intermittently advanced bag forming stripjto press";

,the; slide bracketfinwa manner similar to that shown in PatentN6."2,385,229'aboveQreferred to.

Each slide: bracket 34; 35 israrran'ged to be retracted by springs 42which hold the rollerw4fl againstits cam.

i One of'the sealing'members 30.of'eachsealing unit is heated and; ashereinshown, comprises arserrated orknurled. faced metallic memberfo'rmed integrally with a laterally movablejor fioatingly mounted;aligning plate 44 arranged to bear against a heating b10ck '46 Iattachedto a supporting member 48 mounted for vertical 2 adjustment in thebracket 34. ;AsjhereinI shown,

the plate 44 is heldflat against the face. of the heat ing block 46 bySprings 50' connected to angle members 52 attached to the? supportingmember .48 so that 'injoperati onjthefplate is free to be; shifted inanyfdirecti'on in a plane ffsubstantially parallel to the'cooperatingfrnember 32 or in a "plane substantially at right angles 'tothe line of reciprocation whereby to permit it to align itself with thecooperating sealing member 32. The heating block'46 may be attached toits supporting member by,bolts 54"and "ma'y be provided lwitlfthe usualelectricalheating eI'ements'FiB including' a thermostat 5 8; Thesupportingfjmember '48 is further provided with bearing pins .60extending. therefrom and arranged to engageheat resisting inserts '62provided" in the rear faces of the block in order toreId'uceheattransfer from 'the block to its supporting member; j v

' The cooperating sealingmembe'r, I32; comprises equivalent materialmade in suitably formed sections provided with tongued fportionsarranged to be received in correspondingly groovedfportions formedin aretaining] member'64 which is rial" to .be f'sealedlfjfA here face ofthe heating block 46 to align the sealing meinber 30 in registrationwith the sealing member 32.

As best shown in Figs. 3 and 6 provision is made in the preferredembodiment of the invention for initially laterally adjusting thesupporting plate '66 and the sealing member 32 carried thereby.withrelation to its supporting member 10 in order to initially disposethe L-shaped sealing member 32;,substantially in lateral alignmentwithits vcooperating "sealing member sn ndj als'ci'with re lation to thwwebnoifstripbf bag orming mate- ,is'h n' one of the registration pins;carried ,by afi adjustable block laterally movable "in' a slotf18 formedin anextension of the' supporting member '10. -Theblock 16' isretaln'ed'in th slot 18 bya shouldereld portion 82,. formedjonjone side'and on the opposite side by a, washer84 and nut 86 cooper- :atingfwitha' threadcdiextension les or the block. The'blockis'arrangedto'beadjusted in the slot .18 by a. screw .aoscoop ratmg with a tapped hole92 in the block, 'the rscrewv beingsupported in an enclfplate 94attached to the extension 80 andmamanne such as toffrestrainthe screwfrom. axial movement during rotation'thereof. Inns; in the'operationof-thedevice, the plate 66 mounted on the 'pin" 69' 'be' movedlaterallyherewith upon-adjustment of the block 16 as described' v v. 1, Asherein'showm the: plate 1.66 is mounted on .the pins 68,- 69 ina-mannersuch 'as'to facilitate removal and replacement thereof. when replacing aworn .sealingmemberor' when a different size is tol 'be lemp1oyed,"and,}vas best shownin Fig. 3, 'the7p1la te 66 i s preferablyhooked-over the lateran, movable" pin, 69; the plate 5 being providedwith ,a vertical slot iliiopen at onef'end and retained inassembled'relation w'ithth'e pin 69 by a; latch 98.carried by'the block16 and engagea yieldable pad whichmay comprise a rubber or secured to atiltingly or floatingly mounted plate 66 adapted to conform itselfinparallel. face to face relation to theopposed plate upon initialengagement 'of'thej sealing membersf30, 32 duri-ngfthe sealingoperation. herinshown, the

tached to and extendingfromigarotatably adjustable supporting member 10,the' plate" being nor- ,i n -.yieldingly; maintained against shoulderedM 10 plate 66 is supporte d' for longitudinaland. slight,tiltingmovement on registration pins 6 8, .69 at- 'ablel 'with ltheuppci edge pf the fplatefifi adjacent the slot 96; The. registration pin68- supporting ,the'other side of the plate 1661s fixed in thesupporting member: l'll's o.lthat'i n order to permit lateralImovementfof" the plate with relation to the pin G8' during adjustment,'the'pl'ate is provided with ahorizontally extendedslot I00 open'at oneendandarrangedto embrace the ffixed registra- 'shown' i n Fig. 2;thefcodperating plate 44 is provided 1 with ajroundopeni'ng N12 forreceivin'gjthe registration pin8 and a horizontally extendedslot]['04"corresponding to the slot I00 to pfiiimit adjustment'of. thesealing members as descr bed. As herein' described; the plate .66 isyieldingly urged" against shouldered portions 12 illsj'ree te g pi jsififlg fiar nd a n' n as :3; .al liii' l'f r ti l'lJl i s in h supportingmember 10 is provided with'a'flanged head or shouldered porti' f lllilflush 'withthe 5113 1 1 f rder 112 Q ij f 5 19 1 v Waring poi t for; ith P a ii s J r-v urged p itionjthe' plate' ei'ng'provi'cld 'With'a,slotted ug to ac n lmodate t e pin l06, Thus,

' registration pluses, 69. i

the screwduringadjustment.

-frdih'thepiiis teens meab'y' ir e-of the-slotted penises m; m1 thelatter providing sumciem rams to permit p vetarmevement oi-the 6 plateon I the pm ea the: mate lifted "off the'pin 69. a t 7 I "111 beeh- IFrom tneeesenptisn mus ai 1 that the plate 'se and th aliiig m mber 320nee thereby; beii-i ially ust uiaterallylwith'respectts-the'coeperatmesseaiingmerrioperation by the'engageineht'ofplate-Pid'vision'is further made for i I l'a'rly adjusting the L-shap'edsealing niember az T i order toihi'tially ali'gil'the-L"substantiallyvrtirel'atioin to its-cooperating L -'shjapd seen g m'em'bers 30and.theeivebficrstrip to be;

V ,5 andeu iis i's'hidorlfiplis'hed bybddilY rotating ,tne suppor't- Iine-member I0 with relation tofthe verticallyadj ustabl'e'support H4carriedbytne reciprocator s'li'de bracket 35. AS l'ie'r'e'insho Writhe-member anis-provided with atshort hub l l'6"ar ranged"to J"v sea edh des illustrated inFig fit into 'a correspondingly recessed portion-H8(qr-me mine mem er lgman'd t "members ar a'dfiustably secured togetherby ,bol'

the members iii and -'I I4, the member ID being pro- --justment thereof.I

"tided tvith areuate slots I526 to perm t rotary 'adherein shown, theconnecting means includes an angul1 estates I the initial period ofengagement of pad -32 Witlithe sealing member' SO in: order-itoreieitiveiy s Wielding"firessurfluflfig athe sealin permit the plate 66to tilt toc'onformlitselfito' a plan lii'iiformly parallel to the member'whefithe plate 66 ismovedaway from engage- "r hent with t shoulders E2I08 of the supportin pinsdunrrgtheinitial engagement of thei sealingmembers, and, thereafter ar-elatively grat'er arid pfefefablyyieldablepressure is'applied' by the pin I4 against the plate 66 to producetheh'at Sfil: I i A As best shown in Fig. 4, the pressure applying pin14 is slidin'gly mounted in a tubular member I56 having a flangedportion I52 at itsforward I endandis yieldingly urged against the rearface of the plate 66 by an initial compress-ion spring I54; interposedbetween theinner end of the: pin and aninterib'r shoulder I56 ofrthemember-150. The'm'ember I59 is itself slidingly'mounted in a chamber'orb ore' I58 formed in the adjoining portions 19, H4, the flangedportion I52 fitting Within theibore I58. and bearing" againsta shoul-L1deredportion I 60 formed in the member 10, a: The

I h'efsupporting-membr J'Ila'nd the parts car a r-e'w tlie'r'eby arerotated bodily ja s a unit "by! ad- 1 dusting meansindieated generally;at 28 extend- "in'g b'etw'e'e'n the members 'm and TM and; "a

vbers 30, 6:2 the initial i compression spring, I 54 -,will yield andthe plate 66 will retractfrom thefsh'oulvders12, mflithereby enablingthe platerfi-ii'fitoitilt I provided with anejrteriorly threadedportion'l34 I -cooperating yvith a swivel I136 carried by the verti- 1tc'ally adjustable "support :14, and; a pivotal eon- -nectiongit carriedby theahgiilarly adjustable member "I9 and havi' a t lireaided portion Icooperating "with an int'e'iiorly threaded :po'rt'idn of the adjustingscrew lea. Thus when it is desired to adjust the member 1-0 the bolts-Ifll are first loosened and upon rotation of the adjus'tin'g screw I30the nieliiloefr'Hl"r'iirafy be rocked with relation to its support H4 todispose the L-shaped sealing member in the desired angular positionwhereu on the bolts 120 "may again be tighte'neda In 'order toholetneadjiisti-ng seiew "l3fl' i'n its adjusted position a spring I42 7carried by the member an is arranged to engag an adjacent face ofahexa'gonal shoulder M4 formed onthe adjusting'scr'evvfthe"springfai'nii I 42 other end oftheimemberxIIHisslidinglyrsupported in a collar I62 retained-againsta'sh'oultiered-portion Hitformed inthe' supportinglmembr M4, by .a''maincompression spring 1 winterposedbetween: the flange 'I52fa'ndcollar I 62:; j The end'of the tubular member, I 50 :provided; with ascrew; I 68' having alarg'e: diameter'head' H 0 extending over theihn'eredge'of the "collaryl62ito hold the partsiin, assembled relationzF'With" this-construction;-it Willi-be s eenhthat prior to engagement ofthe .sealingniembersJSU, 32:,sth'e head pcrtion l5 of .thepinFlllp-isgextended slightly beyond the face ;I'I2 ;of the flange I52-sothat upon initial engagementjo'f the sealing memto conform itself to theplane -ofth pposed j sealing -member 36, by virtue I ofifthelfioating Imounting and the :pivotal bearing; pressuretof: the

:head -15. Thereafter, the underside of: the head -15 of the pressureapplying pin willengagexthe face In of the flanged p'ortion- I5Zqwher-eupon thepin 114 together with the-'slidingly mountedbeing.'ciapable of yielding to permit rotation of n Referring nowparticularlyto'Fig'. 4, thespririg ;pressed' pin 14;,is provided with a!rounded or convex head :15 to'provicle a pivotal-bearing point againstthe rear face of the fioatingly 'or tiltingly mounted plate 66 and, asherein, shown,. the pin tubular member I50 will be retracted againstithepressure of the main compression spring I 66;- to performmthefs'ealingoperation. i o *;1

From the above description it will be observed that-provision is made inthe-present heatsealing apparatus for'first initially adjusting opposed(sealing unitswvertically in their, r'espectivessupporting andhorizontally reciprocal slide brackets I 34, 35, .suitableprovisionbeing "made' for looking the units in their verticallyadjustedlpositioni-as by set screws 11.4. It will be further :ob-\

served that provision is made foitinitiailyadjusting the r-se'alingxpad32 both laterally 'antl'zfangularly,to align the same with relationtoithe webxto -be sealed and with relation to its cooperating q-sealingmember. It will be also observed that is preferably disposed relative tothe platefifi and e the sealing pad 32 carriedtherebyysoias to bearagainst a-substantially central portion ofthe pad M32 ,or at ;a pointsuch as to eflect a substantially nif orm bearing pressure overtheentire area of e I l-shaped pad. Provision is made for mountinnereisuchaswtotwprovide.

v having a pivotal bearing point cooperating p.32 and a singlesubstantially centrally disposed and yieldingly mounted pressure applyinpin with :the pad.

While the preferred embodiment of the invention has been hereinillustrated and described, it will be understood that the invention: maybe embodied in other forms within the scope of the following claims.

,Having thus described the invention, ,whatis .claimed is: r i 1. In acontainer forming machine, in combination, a pair of cooperating sealinmembers, one of said sealing members being supported for ishiftinmovement in any direction in agplane :substantially parallel to theother sealing member, and means associated with said other sealingmember and engageable with said first member'for causing the latter tobe shifted into. align- 'ment therewith during the sealin operation, andmeans for supporting said one sealing member including a backing member,and J means :for yieldably retaining the sealing member in'slidcableengagement with the backing memberito permit said shiftingmovement r l 2. In a container forming machine, in 'combi- I nation, apair of cooperating reciprocatory seal-v ing members, one of saidsealing members being supported for Shifting movement in any directionin a plane substantially at right angles to the lineof reciprocationandprovided with registration openings, and registration pins extended 3through the other sealingmember andengage- Sable with said openings forshifting" said first 'member into alignment therewith, and means i forsupporting said one sealing member including a backing member, and meansfor yieldably retaining the sealing member in slidable engagement withthe backing member to'p'ermit said shifting movement. 7 T i 3; In a teabagging machine of the character described, in combination, means forsupporting and intermittently advancing a strip of folded "bag formingmaterial, two cooperating se'aling members for sealin the bag formingmaterial to form bag sections, one of said sealing members beingsupported for shifting movement in any direction in a planesubstantially parallel to the other sealing member, and meansassociatedwith said other sealing member for shifting said'first memberinto alignment therewith during the sealin operation, and means forsupporting said one sealing member including a, backing member, andmeans for yieldably retaining the sealing member in slidable engagementwith the backingmember to permit said shifting movement; 1 4. In acontainer forming machine, in combination, a pair of cooperating sealingmembers, one of said sealing members being supporte'd to 'be'capable oftilting to conform to the'planeof 60 the other sealing member upon,initial engagement therewith whereby to enable'thesealing'op- ,erationto be performed with uniformsealing .pressure over the area to besealed, thes'econd sealing member being mounted for shifting movementrelative to said one sealing member, and guide rods extended throughboth sealing members for supporting said tiltable sealing member and foreffecting shifting of the second sealing member into alignment therewithupon-movement into sealing engagement.

5. In a container forming machine, in combination, a pair'of cooperatingsealing members, one of said members being floatingly supported andcapable of tilting to conform to theplari-bf-al t he;other sealingmember upon. initial engageriment; therewith, and pressure applyingmeans in- I eluding a yieldingly. mounted and] substantially centrallydisposed pressure member engageable with said floatingly supportedmember whereby ;to enable the sealing operation to be performed withuniform sealin pressure over the area to be sealed, the second sealingmember being mounted for shifting movement relative to said one sealingmember, and guide rods extended through both-"sealing members forsupporting said tilt- 'able sealing member and for effectin shifting .ofthe second sealing member into alignment therewith upon movement intosealing engage- -ment.

5-; 6.-.-In'a container forming machine, in combi- ;-nation, a pair ofcooperating sealin members, ,one of-said members being floatinglysupported and capable of tilting to conform to the plane of the othersealing member upon initial engagement therewith, and pressure applyingmeans ineluding a; yieldingly mounted and substantially :.centrallydiSDOSed pressure member engageable wyvith said 'fioatingly supported.member, said pressure member having a convex head to permit said tiltingmovement thereby, to enable the sealing operation to be performed with auniform sealing pressure over the area to be sealed, the second qsealingmember being mounted for shifting move- :ment-relative to said onesealing member, and

.guide rods extended through both sealing members for supportin saidtiltable sealing member and for effectin shifting of the second sealingg-member into alignment therewith upon movement into sealing engagement.

, -7-. In a machine of the character described,'in

combination, a pair of cooperating sealing members, one of said sealinmembers being sup- ..lported-to'be capable of tilting to conform to theplane of'theother sealing member upon initial rfecting shifting of thesecond sealing member into alignment therewith upon movement into sealinengagement.

8. In a container forming machine, in combination, a pair of cooperatingealing members, one of said sealing members being supported for Hshifting movement in any direction in a plane substantially parallel tothe other sealing member,- means associated with the second sealing-member including guide rods extending through both sealing members andadapted for shifting said first member into alignment therewith, said 1second member being supported on said rods to be capable of tiltin toconform to the plane of -;said first member upon initial engagementtherewith whereby to enable the sealing operation to be performed with auniform sealing pressure 1 over the area to be sealed.

5.5 9. In a container forming machine, in combination, a pair ofcooperating sealing members,

7 one of said sealin members being supported for 7 frb'o'th sealingmembers and adapted for shifting or hernias, rel

" members to assess. 1

h s qne e e l em n l eea afo ms membe vem 1 i 'nitially adjustv estsitil ad m mbe sin larl w t s e eb tast es p e ie- 9 sa d qne ee i s cc perainsj eelin whereby to enable the sealing? operation to be pererm d ith-ani e sealin i r s u -o t-th area tobesealedl M H t s In a conta ner iormn m nation, a pairof cooperating sea-ling members,

, one seal Ho i PP IR s ns n seal sfispeet. t ts s per T ineappmrimatealie Hayi giai latw 4 a ggnember itn'res eteffective aftersaid conforming movement for ap- Q it cooperating sealing member, saidsecond plying the sealing pressure, the second sealing sealin memberbeing mounted for shifting movemember being mounted for shiftingmovement ment in any direction in a plane substantially at relative tosaid one sealing member, and guide right angles to the line ofreciprocation, and. rods extended through both sealing members for meansassociated with said one sealing member supportin said tiltable sealingmember and for including guide rods extending through both effectingshifting of the second sealingmember sealing members and adapted forshifting said i o al e ere h upon movement into cooperating member intoalignment therewith. sealing engagement. s 15. In a container formingmachine, in combi- 11. In a container forming machine, in combination, apair of cooperating sealing members, nation, a pair of cooperatinsealing members, one of said members bein supported for shifting one ofsaid sealing members being supported to movement in any direction in aplane substanbe capable of tilting to conform to the plane of tiallyparallel to the plane of the other sealing and the other sealing memberupon initial engagemember, means associated with the second sealmenttherewith, the second sealing member be ing member including guide rodsextending ing mounted for shifting movement relative to through bothsealing members and adapted for said one sealing member, and uide rodsextended shifting said first member into registered alignt rou h bothsealing members for Supporting ment therewith during the sealingoperation, said said tiltable sealing member and for effecting secondsealing member'being supported on said shifting of thesecondsealingmernber into alignrods to be capable of tilting to conform to thement therewith upon movement into sealing enplane of said first memberupon engagement gagement, and means for enabling said one sealtherewith,and pressure applying means engageing member to be adjusted laterallywith respect able with said second sealin member including to itssupport to effect preliminary approximate a substantially centrallydisposed pressure memalignment thereof with respect to its cooperatingber havin a relatively low compression spring sealing member. effectiveduring initial engagement of the seal- 12. In a.container forminmachine, in combiing members to permit said conforming movenation, apair of cooperating sealing members, ment, and having a relatively highcompression one of said sealing members being supported to springeffective after said conforming movement be capable of tilting toconform to the plane of for applying the sealing pressure.

the other sealing member upon initial engage- 16. In a container formingmachine, in combiment therewith, the second sealing member benation, apair of cooperating sealing members, ing mounted for shifting movementrelative to and means for mounting one of said sealing memsaid onesealing member, and uide rods exhei s to be capable of tilting toconform to the tended through both sealing members for supplane of itscooperating sealin member, said porting said tiltable sealing member andfor efmeans including guide rods on which said one fecting shifting ofthe second sealing member member is mounted for longitudinal and slightinto alignment therewith upon movement into tilting movement, stop meansfor limiting the sealing engagement, and means for enabling said forwardmovement of said one sealing member on one sealing member to be adjustedangularly with the guide rods, a spring pressed and substantialrespectto its support to effect preliminary aply centrally disposed round headpin engageable proximate alignment thereof with respect to its with saidone member for yieldingly urging the cooperating sealing member. sameagainst said stop means, said one member 13. In a container forminmachine, in combi being retracted from said stop means and free nation,a pair of cooperating reciprocatory sealto tilt about said pin uponengagement with its ing members, one of said sealing members beingcooperating sealin member, the second sealing supported to be capable oftilting to conform to member bein mounted for shifting movement theplane of the other sealing member upon inirelative to said one sealingmember, said guide tial engagement therewith, the second sealing rodsbeing tapered at their outer ends and enmember being mounted for shiftinmovement gageablewith openings in said second member relative to saidone sealing member, and guide to efiect shifting thereof into alignmentwith rods extended through both sealing members for said one member uponmovement into sealing ensupporting said tiltable sealing member and forgagement.

em rlat erally withv re: I

hei s to be capable-pf tilting to conioriii to the f plane ofv itseooperatin sealin'g member ysaid' j means including guide rods' onwhiohfsa id bne member is mounted for longitudinal and slight tiltingmovement, stop means" fordimiting" th'e forward movement of said onesealing membeion the guide rods, a spring pressed and substantial-*-1y"centra11y disposed roundh'e'ad pin engageable with said one memberfor;yie1ding1y ur'ging the same against said stop meansgsaid one memberbeing retracted from said stop'imean's arid free to tiitabout said pinupon engagement with its'cooperatmg sealing member, saidfsprin pressedpin bein effective to apply a re1ative1y low pres sure during initialengagement of the sealin members to permit/said conforming movement andto apply a'relatively high pressure after said conforming movementforapplying the sealing" pressure, the second sealing member beingm'oili'ite(1 for 'fsliifting Qniovement relative to said one sealingmmberf aidguide rodsfbeing taupon movement into sealing engagement; r"STANLEY R. HOWARD.

- "REFERENCES orrnn ThefoI Iovv'inQ references are 011 100111 1 theUNITED, STATES PATENTS Number 1 1 Name Date 1 1545,2413 Lower "Oct. 11;1927 1,803,779 Stevens May 5, 1931 1,997,268 Scharpf- Apr. 9,19352,140,117 Salfisberg Dec. 13, 1938 2,209,971 Sonneb0rn' May 14, 19402,385,229 4 Patterson 1 Sept. 18, 1945' 2,414,157 Marziani Jan. 14, 19471948 2,435,657 Irmscher ng; Jan. 20,

